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LakeQuality
B

Smith Lake

Washington County, WisconsinLimited DataMesotrophic

Smith Lake comes in at a B on the grading rubric — a respectable showing for a Wisconsin lake of its size and depth. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Mesotrophic conditions dominate at Smith Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. At 85 acres, Smith Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Within the 15 graded lakes of Washington County, Smith Lake sits at rank 14, near the bottom of the county list.

No invasive species are currently listed at Smith Lake — the lake remains off the Wisconsin infested-waters roster. The fishery is bass-led, with 3 documented species across the lake's records. Public access is available — the lake is on the Wisconsin DNR public-access list. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-10-30. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 13.1 ft. Trophic State Index: 40.

MetricValueGrade
Water Clarity (Secchi Depth)13.1 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)40Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Surface Area85 acres
Public AccessYes

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Smith Lake (14-day solunar calendar)

→ Is it safe to eat fish from Smith Lake? (mercury & PFAS guide)

Smith Lake fishing regulations (limits, seasons, special rules)

Recreation & Access

2
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #14 of 15 lakes in Washington County

Cleaner Lakes Within 30 Miles

Smith Lake holds Grade B. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Washington County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2025. 1 station on file (most recent sample 2025).

Fish Species (DNR-rated)

Panfish(Abundant)Largemouth Bass(Abundant)Northern Pike(Common)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2025-10-30

Monitoring stations: 1